title: Fabrication of polarization-dependent light attenuator in fused silica using a low-repetition-rate femtosecond laser.
abstract: In this Letter, we have demonstrated the direct writing of polarization-dependent light attenuator inside fused silica by tailoring 1 kHz femtosecond (fs) laser induced self-organized nanogratings. Optical birefringence was observed to vary with the polarization plane azimuth of the fs laser and scanning direction. The formation of self-organized nanogratings was confirmed by scanning electron microscopy observation. A polarization-dependent light attenuator was fabricated by forming a plane consisting of nanograting lines inside fused silica by scanning the fs laser. The attenuation efficiency was improved by forming a multilayer nanograting structure. The technique may find important applications in micro-optical devices.
authors.affiliation: State Key Laboratory of Luminescent Materials and Devices and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China.
authors.forename: Fangteng
authors.initials: F
authors.lastname: Zhang
authors.forename: Yongze
authors.initials: Y
authors.lastname: Yu
authors.forename: Chen
authors.initials: C
authors.lastname: Cheng
authors.forename: Ye
authors.initials: Y
authors.lastname: Dai
authors.forename: Jianrong
authors.initials: J
authors.lastname: Qiu